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deinterlace: Clean up error handling in chain and _push_history

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- Consistently unref the chained buffer at the end of the chain
  function, if we're not handing it off to `gst_pad_push`. This avoids a
  few buffer leaks in the error paths in `_chain` and `_push_history`.
- When mapping the video frame fails, return a flow error instead of
  crashing.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2444>
This commit is contained in:
Jan Alexander Steffens (heftig) 2022-05-16 14:14:46 +02:00 committed by Tim-Philipp Müller
parent 9b0fad5f0c
commit 668b0cf939
1 changed files with 45 additions and 32 deletions
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77
subprojects/gst-plugins-good/gst/deinterlace/gstdeinterlace.c
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@ -1090,14 +1090,13 @@ gst_deinterlace_get_buffer_state (GstDeinterlace * self, GstVideoFrame * frame,
(m) == GST_VIDEO_INTERLACE_MODE_ALTERNATE ? "A" : \
(m) == GST_VIDEO_INTERLACE_MODE_FIELDS ? "FIELDS" : "P")
static void
static GstFlowReturn
gst_deinterlace_push_history (GstDeinterlace * self, GstBuffer * buffer)
{
int i = 1;
GstDeinterlaceFieldLayout field_layout = self->field_layout;
gboolean tff;
gboolean onefield;
GstVideoFrame *frame = NULL;
GstVideoFrame *field1, *field2 = NULL;
guint fields_to_push;
guint field1_flags, field2_flags;
@ -1107,26 +1106,40 @@ gst_deinterlace_push_history (GstDeinterlace * self, GstBuffer * buffer)
/* we will only read from this buffer and write into fresh output buffers
* if this is not the case, change the map flags as appropriate
*/
frame = gst_video_frame_new_and_map (&self->vinfo, buffer, GST_MAP_READ);
field1 = gst_video_frame_new_and_map (&self->vinfo, buffer, GST_MAP_READ);
if (G_UNLIKELY (field1 == NULL)) {
GST_ERROR_OBJECT (self, "Failed to map video frame for %" GST_PTR_FORMAT,
buffer);
return GST_FLOW_ERROR;
}
tff = GST_VIDEO_FRAME_IS_TFF (frame);
onefield = GST_VIDEO_FRAME_IS_ONEFIELD (frame);
tff = GST_VIDEO_FRAME_IS_TFF (field1);
onefield = GST_VIDEO_FRAME_IS_ONEFIELD (field1);
fields_to_push = (onefield) ? 1 : 2;
if (G_UNLIKELY (self->history_count >=
GST_DEINTERLACE_MAX_FIELD_HISTORY - fields_to_push)) {
GST_WARNING_OBJECT (self, "history count exceeded limit");
gst_video_frame_unmap_and_free (frame);
return;
gst_video_frame_unmap_and_free (field1);
return GST_FLOW_OK; /* When does this happen? */
}
gst_deinterlace_get_buffer_state (self, frame, &buf_state, &interlacing_mode);
field2 = gst_video_frame_new_and_map (&self->vinfo, buffer, GST_MAP_READ);
if (G_UNLIKELY (field2 == NULL)) {
GST_ERROR_OBJECT (self, "Failed to map video frame for %" GST_PTR_FORMAT,
buffer);
gst_video_frame_unmap_and_free (field1);
return GST_FLOW_ERROR;
}
gst_deinterlace_get_buffer_state (self, field1, &buf_state,
&interlacing_mode);
GST_DEBUG_OBJECT (self,
"Pushing new frame as %d fields to the history (count before %d): ptr %p at %"
GST_TIME_FORMAT " with duration %" GST_TIME_FORMAT
", size %" G_GSIZE_FORMAT ", state %s, interlacing mode %s",
fields_to_push, self->history_count, frame,
fields_to_push, self->history_count, field1,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)),
gst_buffer_get_size (buffer),
@ -1166,8 +1179,6 @@ gst_deinterlace_push_history (GstDeinterlace * self, GstBuffer * buffer)
}
}
field1 = frame;
field2 = gst_video_frame_new_and_map (&self->vinfo, buffer, GST_MAP_READ);
if (field_layout == GST_DEINTERLACE_LAYOUT_TFF) {
GST_DEBUG_OBJECT (self, "Top field first");
field1_flags = PICTURE_INTERLACED_TOP;
@ -1243,18 +1254,15 @@ gst_deinterlace_push_history (GstDeinterlace * self, GstBuffer * buffer)
gst_video_frame_unmap_and_free (field2);
}
/* we can manage the buffer ref count using the maps from here on */
gst_buffer_unref (buffer);
self->history_count += fields_to_push;
self->cur_field_idx += fields_to_push;
GST_DEBUG_OBJECT (self, "Pushed buffer -- current history size %d, index %d",
self->history_count, self->cur_field_idx);
if (self->last_buffer)
gst_buffer_unref (self->last_buffer);
self->last_buffer = gst_buffer_ref (buffer);
gst_buffer_replace (&self->last_buffer, buffer);
return GST_FLOW_OK;
}
static void
@ -2184,7 +2192,7 @@ gst_deinterlace_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
GST_OBJECT_LOCK (self);
if (self->reconfigure || gst_pad_check_reconfigure (self->srcpad)) {
GstCaps *caps;
gboolean force_reconfigure = FALSE;
gboolean force_reconfigure = FALSE, res;
if ((gint) self->new_fields != -1) {
force_reconfigure |= (self->user_set_fields != self->new_fields);
@ -2199,21 +2207,23 @@ gst_deinterlace_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
self->reconfigure = FALSE;
GST_OBJECT_UNLOCK (self);
caps = gst_pad_get_current_caps (self->sinkpad);
if (caps != NULL) {
if (!gst_deinterlace_setcaps (self, self->sinkpad, caps,
force_reconfigure)) {
gst_pad_mark_reconfigure (self->srcpad);
gst_caps_unref (caps);
if (GST_PAD_IS_FLUSHING (self->srcpad))
return GST_FLOW_FLUSHING;
else
return GST_FLOW_NOT_NEGOTIATED;
}
res = (caps != NULL);
if (res) {
res = gst_deinterlace_setcaps (self, self->sinkpad, caps,
force_reconfigure);
gst_caps_unref (caps);
} else {
}
if (!res) {
gst_pad_mark_reconfigure (self->srcpad);
return GST_FLOW_FLUSHING;
if (GST_PAD_IS_FLUSHING (self->srcpad))
ret = GST_FLOW_FLUSHING;
else
ret = GST_FLOW_NOT_NEGOTIATED;
goto out_unref;
}
} else {
GST_OBJECT_UNLOCK (self);
@ -2243,13 +2253,16 @@ gst_deinterlace_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
self->discont = TRUE;
}
gst_deinterlace_push_history (self, buf);
buf = NULL;
ret = gst_deinterlace_push_history (self, buf);
if (ret != GST_FLOW_OK)
goto out_unref;
do {
ret = gst_deinterlace_output_frame (self, FALSE);
} while (!self->need_more && self->history_count > 0 && ret == GST_FLOW_OK);
out_unref:
gst_buffer_unref (buf);
return ret;
}